Gas-testing device



May 29, 1928. 1,671,795

R. E. TERHUNE GAS TESTING DEVICE Filed Aug. 27, 1925 awe/"tot Patented May 29, 1928.

Roi AL n. meetin s, or re'rnnson, Jnnsnt.

eiis-rnsrme bsvi e iifi ueanon med An us; 27, 1925. serial m, 52,573.

This invention relates to certain improve nients in gas testing devi'ces and has ijel'a tion .Inore particularly to a device of "this kind ofa portable type, it being an obg'ect of the invention to provideiatester ivhici is free of liquids and whichopjerates a ma ner to provide quick anumsy determinaL tions. V

Another cct of the iiive'ntion to provide a device of this kind which is par ict larlyiaclapted for use todetermine the perce itage of p a .constitueiit such as elites oxide, drbo nmmxrde, sulphur dioxide. on gen, chlorine and other gasesfjand whereinsuch constituent absorbed by suitable material \vithina container resetting in a partial vacuum within the container which is transmitted to asuitable vacuum gauge properly calibrated findicatethe percentage oi thef'constiti ent absorbed.

The invehtion consists int-he details of construction (and in the combination and m;- rangcment of the parts proved gastesnng device whereby of imdevice rendered simpler, lcssenpensiveand otherv se n ore convenient and advantageous for use, as will be hereinafter more fully 'set forth.

The novel features of my invention panying drawings, wherein:-

Figure is a diagraniniaticview ith portion's section illustrating testing device on stribted in accordance With an embodinient of iny inyention; i L

Figure 2 is a longitudinal sectional View taken through the container as illustrated in l igure 1 With asstmiated parts in elevation.

disclosed in the accompanying draw ings, C denotes an elongated container the interior of which cmistitut'es what is termed the absorption chamber. The container C, as herein disclosed, is an elongated tubular mcn'iber 1 of requisite dimensions and which has its opposite ends closed by the removable cups 2 and 3, said member 1 and caps 2 and 3 being, of brass or othermetal. it

In communication with the container C through the cap 2 is an end portion of a head 4 of a T-connector A, the opposite end portion of said head 4 having suitablv couplcd thereto flexible tubing 5 of any esired cefrtirin' important advantages "are enmmumuene length and leading from an aspirator bulb 6. This bulb 6 is or rubber and-of hand size and contains a check valve 7. This bulb 6 "also has'n communication therewith tubitig 8 adaptell to communicate With the source of the gas to betested.

j'l'hels teni 9 ofthe connector A has coupled thereto thctubing 10 which is also properlV coupled to the gauge G of a vacuum type fantLWh'ieh comprises the index or pointer 11 enacting with the calibrations 12 to give the required reading. The gau G in itself forms no part or the 'preser'h invention as thesame may be one of the many types now on the market, it only being-required that the calibi aitions read the percentage in con nect ion With the constituent or gas to be area; '1 a H i The cap 3 lies arranged thereina rubber plug 1 14L and which seats tightly against the adjacent end of the member 1 toassin a men-gm lconnection. Disposed through the leap 3 and the applied plugl i isan end portion ofah L donnector 15 ftheopposite end portion ot said connector having suitably I c ottled theretolan end portion of an elon- "gaireu tubing is, said tubing 16 mending a carry-0r conduit. Arranged within the member 1 at a desired distance inwardly of theta-p3 isa metal screen 17intersectihg the bore 01' Chamber of si'i'ch inen'lber, and placed irithinfsaid chitlnber betweentbe screen 17 and the cap or more particularly the lug "14 is n absorbent B, said absorbent being inabcordepce tvith the character ofthe gas to be tested or determined and ota dry character. Atthis tiihel Wish to state {that I do Wish "to be understood as limiting to any particular kind or absdrbent. Coming; wit'hl'the tubing 5 is a pinch cock 18 "ahcbcoticliing Mur ne tubing 16 is the =pinhtek 19 both or said mck 18 and 19 b i i'ificai ried bivthe shutoff bracket 20.

The desiredhbsdrbent B is placed Within the nieniberl with the cap 3re1nov'ed and i said member 1 in substantiallv a vertical In making a test, the tubing 8 is connected to the source of supply and the cocks 18 and 19 being held open by a digit of the left hand, preferably the thumb. This opening 'of the cocks is readily permitted in view of the fact that the operating ends of the cocks are in suflicient proximity to enable the thumb to engage both of them when the other digits or fingers are engaged against the under side of the bracket 20. The aspirator bulb 6 is then squeezed or operated with the right hand regularly for a few minutes to cause the gas to be drawn from its supply and forced completely through the member 1, it being emitted through the tubing 16. When it is believed that a good sample of the gas is within the member 1 the pinch cocks are released to close the flow through both of the tubings and 16. The index or pointer of the gauge G will immediately begin to move and indicate the percentage of the desired constituent of the gas due to the fact that such constituent, such as carbon dioxide orthe like, will be absorbed by the absorption medium B and by so doing reducing the volume and pressure within the member 1, resulting inthe creation of a partial vacuum. This partial vacuum in turn is transmitted to the gauge G through the tubing 10 causing the index or pointer of the gauge to actuate to indicate the percent of the constituent absorbed by the absorbent when the index or pointer of the gauge comes to a rest or stop which is generally accomplished in about one and one-half minutes time but this, of course, is variable due to the condition of the absorbent B and the gas being tested. After the reading has been taken of the gauge, the cocks 18 and 19 are momentarily open whereupon the index or pointer of the gauge will return to its zero position and the equipment is ready for another operation or determination.

From the foregoing description it is thought to be obvious that a gas testing device constructed in accordance with my invention is particularly well adapted for use by reason of the convenience and facility with which it may be assembled and operated, and it will also be obvious that my invention is susceptible of some change and modification without departing from the principles and spirit thereof and for this reason I do not wish to be understood as limiting myself to the precise arrangement andformation of the several parts herein shown in carrying out my invention in practice except as hereinafter claimed.

The desired determination is completed 1. A testing device of the class described, comprising a tubular member, removable caps at each end of said tubular member, a flexible conduit having connection with one of said caps for delivering within said tubular member at one end thereof, said conduit leading from a source of supply, an

aspirator coacting with said conduit, a vac-v uum gauge in communication with said eonduit adjacent the cap, a second flexible conduit connected with the other cap and having communication with the tubular member at the opposite end thereof, an absorbent of a dry character within said tubular member at one end thereof, means engageable with each of the flexible conduits normally compressing the same to close flow therethrou h, the means normally com ressing one 0% the conduits being positioned immediatel adjacent to the means for closing the secon conduit to permit both of the means to release the conduits upon operation by a single digit of the hand. I

2. A testing device of the class described,

comprising a tubular member, removable caps at each end of said tubular member, a flexibleconduit having connection with one of said caps for delivering within said tubular member at one end thereof, said conduit leading from a source of supply, an aspirator coacting with said conduit, a vacuum gauge in communication with said conduit adjacent the cap, a second flexible conduit connected with the other cap and having communication: with the tubular member at the opposite end thereof, a metal screen member arranged within one end of the tubular member, an absorbent of a dry character compressed within said metal screen member, means engageable with each of the flexible conduits normally compressing the same to close flow therethrough, the means normally compressing one of the conduits being positioned immediately adjacent to the means for closing the second conduit to permit both of the means to release the con-- duits upon operation by a single digit of r the hand. V

In testimony whereof I hereunto aflix my signature.

ROYAL E. TERHUNE. 

